title: Alterations in proestrous LH, FSH, and prolactin surges in middle-aged rats.
mesh_terms: D000375:Aging; D000818:Animals; D002940:Circadian Rhythm; D004971:Estrus; D005260:Female; D005640:Follicle Stimulating Hormone / Q000378:metabolism*; D007986:Luteinizing Hormone / Q000378:metabolism*; D011247:Pregnancy; D011359:Proestrus; D011388:Prolactin / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D011388:Prolactin; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone